Designation:A403/A403M−16StandardSpecificationforWroughtAusteniticStainlessSteelPipingFittings1ThisstandardisissuedunderthefixeddesignationA403/A403M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoverswroughtstainlesssteelfittingsforpressurepipingapplications.21.2SeveralgradesofausteniticstainlesssteelalloysareincludedinthisspecificationGradesaredesignatedwithaprefix,WPorCR,basedontheapplicableASMEorMSSdimensionalandratingstandards,respectively.1.3ForeachoftheWPstainlessgrades,severalclassesoffittingsarecovered,toindicatewhetherseamlessorweldedconstructionwasutilized.Classdesignationsarealsoutilizedtoindicatethenondestructivetestmethodandextentofnondestructiveexamination(NDE).Table1isageneralsummaryofthefittingclassesapplicabletoallWPgradesofstainlesssteelcoveredbythisspecification.TherearenoclassesfortheCRgrades.Specificrequirementsarecoveredelsewhere.1.4Thisspecificationisexpressedinbothinch-poundunitsandinSIunits.However,unlesstheorderspecifiestheapplicable“M”specificationdesignation(SIunits),themate-rialshallbefurnishedtoinch-poundunits.1.5ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.6Thisspecificationdoesnotapplytocaststeelfittings.AusteniticstainlesssteelcastingsarecoveredinSpecificationsA351/A351M,A743/A743M,andA744/A744M.2.ReferencedDocuments2.1ASTMStandards:3A351/A351MSpecificationforCastings,Austenitic,forPressure-ContainingPartsA743/A743MSpecificationforCastings,Iron-Chromium,Iron-Chr...
